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  1. Qt
  2. QTBUG-56003

Double buffering and vsync support

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    • Suggestion
    • Resolution: Out of scope
    • P2: Important
    • None
    • 5.8.0 Alpha
    • QPA: LinuxFB
    • None

    Description

      Double buffering can be implemented if the virtual resolution (xres_virtual, xyres_virtual) is at least twice as large the screen resolution (xres, yres) by drawing to the non-visible area and then issuing the FBIOPAN_DISPLAY ioctl with an adjusted xoffset/yoffset to do a buffer swap.

      An environment variable can be added to optionally force issuing the FBIO_WAITFORVSYNC ioctl if FBIOPAN_DISPLAY isn't vsynced.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-55768 [b2qt] Toradex Colibri VF image should switch to kms driver usage

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Task - A task that needs to be done. QTBUG-56306 Add a DRM dumb buffer platform plugin - or make it an option for linuxfb

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Open
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              lagocs Laszlo Agocs
              net147 Jonathan Liu
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                Updated:
                Resolved:

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